$ git clone -n https://src.fedoraproject.org/rpms/rust-xml.git /var/lib/mock/f45-build-46272-832/root/chroot_tmpdir/scmroot/rust-xml
Cloning into '/var/lib/mock/f45-build-46272-832/root/chroot_tmpdir/scmroot/rust-xml'...
$ git fetch origin 79f94ffe8605d8116eebc1906813962b677cbed2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-xml
 * [new ref]         79f94ffe8605d8116eebc1906813962b677cbed2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 79f94ff Update to version 1.4.0; Fixes RHBZ#2520777